CN2904488Y - On-line measuring system for planeness of cell phone lid - Google Patents

Abstract

On-line measuring system of planarity of the handset cover plate is characterized in that the system constitution adopts a nozzle-flapper type pneumatic measuring device,taking the measured work piece as the flapper, the pneumatic measuring head cooperating with the flapper is held on the measuring head plywood; at least four measuring points aren't at the same place corresponding to the measured work piece,the nozzle ends of the pneumatic measuring head at all locations are all on the same standard plane.According to the shape of the measured work piece,the system distributes various measured points,then determines the space between the work piece and the nozzle end at each measuring point,adopts the least square method to obtain the planarity error.The utility model is able to automatically measure the planarity of work pieces on the production site ,has a high accurate,can quickly and effectively separate the batch qualified work pieces.

Description

The hand-set lid flatness on-line system

Technical field:

The utility model relates to the automatic measuring system that is applied in the production scene, more specifically says so and carries out the system that mass production field is measured automatically for the mobile phone cover sheet.

Background technology:

At present, in the production of mobile phone cover sheet, be to be undertaken fully by human eye observation to the measurement of its flatness, directly observe the concavo-convex situation of surface of the work and carry out the judgement roughly of flatness, thereby distinguish qualified and underproof workpiece in the production scene.But this determination methods can't draw the concrete flatness numerical value of workpiece, can only rely on workman's subjective vision to judge qualified product and defective item roughly, and this judgment mode not only working strength of workers is big, and poor reliability, and erroneous judgement property is bigger.

Summary of the invention:

The utility model is for avoiding above-mentioned existing in prior technology weak point, and a kind of hand-set lid flatness on-line system is provided.This system not only can be in the flatness of the on-line automatic measuring workpieces in production scene, and the precision height, can be quickly and efficiently the qualified product of the workpiece produced in batches be carried out sorting.

The technical scheme that the utility model technical solution problem is adopted is:

The characteristics of the utility model measuring system are:

System constitutes: adopt the nozzle baffle type air measuring device, back pressure signal with described nozzle baffle type air measuring device output is a measuring-signal, back pressure measuring-signal on each measuring point is respectively through separately data acquisition channel, carries out data processing and demonstration to computer system;

In described air measuring device, as the baffle plate in the nozzle-flapper structure, the plug jet that is equipped with baffle plate is clamped on the gauge head clamping plate with measured workpiece; Corresponding at least four of the measured workpiece settings measuring point on same position not, the nozzle face of the plug jet on all point positions is on the same standard flat.

Each measured point of distribution of shapes according to measured workpiece, on described standard flat, determine the x-y coordinate system, therefore obtain the x and the y coordinate figure of each measuring point, record gap between each point position place workpiece and the nozzle face by air measuring device, be the z value, adopt the least square fitting plane to try to achieve flatness error as the evaluation basal plane.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

1, because tested hand-set lid is softer thinner, light weight, yielding, adopt contact type measurement that measured workpiece is deformed, bring bigger measurement of planeness error, the utility model adopts contactless pneumatic gauging, effectively avoid workpiece deformation, improved measurement accuracy.

2, because the measured workpiece out-of-shape, need choose a plurality of measuring points when measurement plane is spent samples, in the production reality, measured workpiece is a large-scale mass production, detection efficiency requires to detect a workpiece second for 2-3, be that desired detection speed is higher, the utility model adopts the mode of pneumatic gauging to have higher dynamic responding speed, can satisfy the rate request of on-line measurement well.

3, flatness error is defined as the variation of measured workpiece real surface to the ideal plane, and the position of ideal plane should meet minimal condition, and promptly the mutual alignment of ideal plane and physical plane should make the physical plane that the maximum variation of ideal plane is minimum.The utility model calculates flatness error by adopting least square method, can programme with computer more easily, realizes data processing, the measurement of flatness is reached rapidly, accurately, reliably.

Description of drawings:

Fig. 1 constitutes schematic diagram for the utility model system.

Fig. 2 is a measuring point distribution schematic diagram on the utility model measured workpiece.

Fig. 3 looks schematic diagram for the utility model gauge head clamp region master.

Fig. 4 is the utility model gauge head clamp region schematic top plan view.

Number in the figure: 1 measured workpiece, 2 gauge head clamping plate, 3 measuring point a, 4 measuring point b, 5 measuring point c, 6 measuring point d, 7 measuring point e, 8 plug jet a, 9 plug jet b, 10 plug jet c, 11 plug jet d, 12 plug jet e.

Below by embodiment the utility model is further described:

Embodiment:

Referring to Fig. 1, compressed air enters each pressurizer after the filtering of source of the gas process air cleaner, each pressurizer is exported same fixing operating pressure value, compressed air flows to plug jet through throttle orifice, and in the nozzle of plug jet, spray, the measured workpiece surface is baffle plate, constitutes nozzle-baffle mechanism with this.Stream pressure between throttle orifice and the plug jet in the pipeline section is " back pressure ", and the gap of back pressure and nozzle flapper is functional relation one to one.The back pressure that each transducer forms each measuring point respectively is converted to standard voltage value output, and by each channel data capture card this magnitude of voltage is gathered, and in conjunction with the gap width of each nozzle and measured workpiece, adopts least square method can obtain the flatness error of workpiece.

Fig. 2, Fig. 3 and shown in Figure 4, in air measuring device, as the baffle plate in the nozzle-flapper structure, the plug jet that is equipped with baffle plate is clamped on the gauge head clamping plate 2 with measured workpiece 1; Corresponding to measured workpiece 1 at least four not measuring points on same position are set, establish five measuring points in the present embodiment altogether, comprise measuring point a 3, measuring point b 4, measuring point c 5, measuring point d 6 and measuring point e7, the corresponding plug jet that is provided with also is five on the gauge head clamping plate 2, the nozzle face that comprises plug jet a 8, plug jet b 9, plug jet c 10, plug jet d 11 and 12, five plug jets of plug jet e is on the same standard flat.

Pneumatic gauging is to be medium with compressed air, utilize air at ducted flow and pressure with the physical dimension of pipeline or the characteristic of change of shape, size quantity or displacement changed being converted into flow or pressure variety, thereby realize high-precision measurement.Pneumatic gauging has the advantage of series: belong to relative measurement, can obtain very high certainty of measurement, especially be fit to the measurement of form error; Non-contact measurement can not scratch surface of the work, and ergometry is very little; Can blow away the oil, water and the dust that invest surface of the work, have self-cleaning action, can improve certainty of measurement; Simple in structure, operating maintenance convenience; Less demanding to surrounding environment, be applicable to the online use of production scene; Good stability, the computer technology that is used Digital Measuring Technique make to measure and are able to intellectuality, digitlization.

The selection of each device and parameter in the measuring system:

Source of the gas, operating pressure are 0.8MPa, and air displacement is 0.046m ³/ min.

Filter is used for water, oil and common its impurity that filtering compressed air contains, to improve certainty of measurement.

The selection of operating pressure, operating pressure are meant through offering the pressure of back pressure air chamber after filtering, the voltage stabilizing, select less operating pressure for the workpiece that hardness is lower, deform to prevent measured workpiece; Select less operating pressure for the workpiece that weight is less, in order to avoid workpiece is blown afloat; For surface oil, water, occasion that dust is heavier, select higher pressure, make to measure to have self-cleaning ability.Testing surface, comparatively suitable operating pressure are 0.5Kgf/cm ²

Pressurizer, each drive test amount unit need be provided with pressurizer respectively, and pressurizer is according to the operating pressure value of setting, as 0.5Kgf/cm ²Carrying out pressure sets.

Pressure sensor, the corresponding pressure sensor that is provided with separately of each gauge head, for the operating pressure of measuring system 50KPa, the range of transducer is set at 80KPa, and operating voltage is 12VDC, is output as 1-5V, and precision is 0.5%F/S.

Plug jet adopts contactless pneumatic axial gauge head, and nozzle bore is a circular hole, the linearity range of measuring can not be too short, can be for about 0.1mm, and nozzle diameter is more little, linearity range is just short more, but linearity range is too little, can bring very big difficulty to measurement, but because the surface shape features of measured workpiece, nozzle diameter can not be too big, therefore, the diameter that can select each nozzle is 0.8mm, reduces the diameter of nozzle like this under the situation that guarantees big linearity range as far as possible.

Throttle orifice, after throttle orifice and the gaging nozzle coupling, under given operating pressure, the straightway of its back pressure-backlash characteristics curve should comprise measuring range, and the diameter of throttle orifice is defined as 0.8mm.

Data collecting card, select the PCI-9111DG type data collecting card of Taiwan ADLINK company, this card is a kind of high-performance data capture card based on pci bus, have: 32 pci buss, promptly inserting promptly has, and the single input of 16 tunnel bipolaritys is after the magnitude of voltage collection input computer of capture card with five transducer outputs, in conjunction with the linear relationship of magnitude of voltage and gap width in the plug jet calibration experiment, just can obtain the z coordinate figure of each measuring point.

The method of least square method evaluation flatness error is the method for trying to achieve flatness error with the least square fitting plane as the evaluation basal plane.The method for building up of least square central plane is:

If the least square plane equation is: Z=AX+BY+C

As long as determined the value of A, B, C, just determined this plane equation, find the solution the value of A, B, C to get off.The coordinate of each point is (x on the actual measurement workpiece planarization _i, y _i, z _i) (i=1, Λ k) according to principle of least square method as can be known, the value (x of each point on the actual measurement plane _i, y _i, z _i) with least square plane on each point square distance and be the minimum, promptly

$F=\underset{i=1}{\overset{k}{\mathrm{\Σ}}}{(A{x}_i+B{y}_i+C-z_2)}^2$ Be minimum.According to extremum principle, the value that make F is for minimum, and will make F is zero to the local derviation value of A, B, C.Promptly

$\left\{\begin{array}{c}\frac{\∂F}{\∂A}=0\\ \frac{\∂F}{\∂B}=0\\ \frac{\∂F}{\∂C}=0\end{array}\right.$

Separate above-listed equation group, can determine that three parameters of A, B, C on this plane are

$\left\{\begin{array}{c}A=\frac{S_{12}{S}_{23}-S_{13}{S}_{22}}{{{\mathrm{<figure-callout\; id="12"\; label="S"\; filenames="Y20062007166500093.png"\; state="\{\{state\}\}">S</figure-callout>}}_{12}}^2-S_{11}{S}_{22}}\\ B=\frac{S_{12}{S}_{13}-S_{11}{S}_{23}}{{{\mathrm{<figure-callout\; id="12"\; label="S"\; filenames="Y20062007166500093.png"\; state="\{\{state\}\}">S</figure-callout>}}_{12}}^2-S_{11}{S}_{22}}\\ C=\frac{\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{z}_i-A\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{x}_i-B\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{y}_i}{k}\end{array}\right.$

Wherein

$\left\{\begin{array}{c}{S}_{11}=\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{x_i}^2-\frac{1}{k}{\left(\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{x}_i\right)}^2\\ {\mathrm{<figure-callout\; id="12"\; label="S"\; filenames="Y20062007166500093.png"\; state="\{\{state\}\}">S</figure-callout>}}_{12}=\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{x}_i{y}_i-\frac{1}{k}\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{x}_i\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{y}_i\\ S_{13}=\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{x}_i{z}_i-\frac{1}{k}\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{x}_i\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{z}_i\\ S_{22}=\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{y_i}^2-\frac{1}{k}{\left(\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{y}_i\right)}^2\\ S_{23}=\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{y}_i{z}_i-\frac{1}{k}\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{y}_i\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{z}_i\end{array}\right.$

Just set up the least square plane equation according to the above value that obtains A, B, C of finding the solution, obtained on the plane each measuring point respectively the side-play amount D of least square plane _i=Ax _i+ By _i+ C-z _i, judge and find out D _iMaximum D _MaxWith minimum value D _Min, then the flatness error on tested plane is $\mathrm{\&Delta;t}=\frac{D_{\max }-{\mathrm{<figure-callout\; id="2"\; label="D\; min\; A"\; filenames="Y20062007166500093.png"\; state="\{\{state\}\}">D</figure-callout>}}_{\min }}{\sqrt{A^{}}}.$

Obviously, measuring point is determined good x-y coordinate system in the plane after the position that distributes on the workpiece is determined, just can obtain the x coordinate and the y coordinate of each measuring point.If the end face of each air-blast atomizer is on same standard flat when initial, when measuring workpieces, each nozzle is the z coordinate figure of each measuring point just apart from the different gap value of workpiece measuring point so.

With gas circuit do not have gas leakage connect appropriate after, demarcate the characteristic curve of five air-blast atomizers with standard gauge block, with the gap width that guarantees five nozzles and workpiece all in the range of linearity of each nozzle, note when demarcating plug jet, after opening air compressor machine work, the opening entry data need wait for a period of time immediately, comparatively stable to source of the gas, opening entry data again behind the voltmeter numerical stability.

In concrete the enforcement, select PCI-9111DG type data collecting card for use, this card is a kind of high-performance data capture card based on pci bus.Select for use ACLD-9188 type terminal board to link to each other with data collecting card, can on terminal board, insert the aanalogvoltage input signal easily like this by cable.

Capture card in conjunction with the linear relationship of magnitude of voltage and gap width in the plug jet calibration experiment, just can obtain the z coordinate figure of each measuring point after computer is advanced in the magnitude of voltage collection of five transducer outputs.After five gap widths in the range of linearity separately all obtain, just can obtain the flatness of measured workpiece according to the computational methods coding of the flatness of above introduction.Flatness is qualified product with at 0.06mm as requested, and surpassing 0.06mm is substandard products just.

Measuring process is: at first the nozzle face with five plug jets all is aligned on the same standard flat, after the calibration, and vertical moving about five just necessary whiles of gauge head.Then five gauge heads are raised simultaneously, and workpiece are put on the plane, adjust the gap width of five gauge heads and workpiece, five gap widths that make interface display all in the range of linearity of nozzle characteristic curve, treat that reading is stable after, just can draw the flatness numerical value of workpiece.If there is the gap width of individual nozzles and workpiece to exceed the range of linearity of nozzle, then need adjust the gap of five gauge heads and workpiece, to guarantee that five gap widths all in the range of linearity of nozzle characteristic curve, just can draw the correct flatness of workpiece.

When actual measurement, the workpiece of producing in enormous quantities on the production line has been carried out sample testing, following table has been listed the flatness numerical value of five duplicate measurementss of 10 workpiece.

By above experimental data as seen, the good reproducibility that this cover measuring system is measured, the precision height, resolution can reach 1 μ m.Utilize this cover system can realize the accurate measurement of the similar part flatnesses such as framework of adversary's organizational security protecting cover plate and cover plate, easy to operate, rapidly, precision can reach 0.01mm, and can be automatic assembly line the qualified product and the defective item of workpiece carried out quick sorting.The automation control of all automatic measurement of the high-efficiency high-accuracy of the suitable industry spot of this system and production process.

Claims (2)

1, hand-set lid flatness on-line system is characterized in that:

Described system constitutes: adopt the nozzle baffle type air measuring device, back pressure signal with described nozzle baffle type air measuring device output is a measuring-signal, back pressure measuring-signal on each measuring point is respectively through separately data acquisition channel, carries out data processing and demonstration to computer system;

In described air measuring device, as the baffle plate in the nozzle-flapper structure, the plug jet that is equipped with baffle plate is clamped on the gauge head clamping plate (2) with measured workpiece (1); Corresponding to measured workpiece (1) at least four not measuring points on same position are set, the nozzle face of the plug jet on all point positions is on the same standard flat.

2, measuring system according to claim 1, it is characterized in that five not measuring points on same position being set corresponding to measured workpiece (1), comprise measuring point a (3), measuring point b (4), measuring point c (5), measuring point d (6) and measuring point e (7), gauge head clamping plate (2) are gone up the corresponding plug jet that is provided with and also are five, comprise plug jet a (8), plug jet b (9), plug jet c (10), plug jet d (11) and plug jet e (12), the nozzle face of five plug jets is on the same standard flat.

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